Freezing for a few seconds after switching tabs, freezing for a second without doing anything.

Hello
I use Firefox v. 25.0 (If i remember correctly I had this problem at 24 too) and I my browser freezes for a few seconds, maybe every 10 seconds. It only freezes for about give or take, 3 or 4 seconds but it is starting to bug me.
I have tried
-> Safe mode - still happens in safe mode.
-> Restarting firefox (multiple times) - The last few restarts I have removed/disabled any add ons or extentions. It always starts with out the freezing, but maybe after 1 or 2 days the freezing comes back again. This time I'm just half way done with it so I haven't bothered to disable much.
-> Checking for multiple duplicated files in the firefox folder - didn't have any.
I apologize that this is a commonly asked question, but I wanted to see if I could get any help here before having to move to chrome (which is not recommended from my sister), or internet explorer (which is in my recycle bin...)
Thank you in advance.

Although your IE shortcut might be in the recycle bin, you'll still want to have IE installed for those special sites that only support IE...
Do you usually have a lot of tabs open? By default, Firefox updates the file which stores open windows and tabs every 15 seconds. The larger this file gets, the longer this takes. A major overhaul was made for Firefox 25 to make this more efficient, so this might not be your issue, but you can stretch the interval out to 60 seconds and see whether that makes a difference. Here's how:
(1) In a new tab, type or paste '''about:config''' in the address bar and press Enter. Click the button promising to be careful.
(2) In the search box that appears above the list, type or paste '''session''' and pause while the list is filtered
(3) Double-click '''browser.sessionstore.interval''' and change the value from 15000 to 60000 (this value is in milliseconds: 15000/1000 = 15 seconds, 60000/1000 = 60 seconds). I don't know whether this takes effect immediately or the next time you start Firefox.
Does that help?
If that doesn't make much/any difference, have you set up Firefox Sync?

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Freezing for a few seconds after switching tabs, freezing for a second without doing anything.

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